Specifications of UT18 Series Voltage and Continuity Testers
| Specifications | Range | UT18C | UT18D |
| Voltage (V) | 6V | 5V±1V | |
| 12V | 8V±1V | 8V±1V | |
| 24V | 18V±2V | 18V±2V | |
| 50V | 38V±4V | 38V±4V | |
| 120V | 94V±8V | 94V±8V | |
| 230V | 180V±14V | 180V±14V | |
| 400V | 325V±15V | 325V±15V | |
| 690V | 562V±24V | 562V±24V | |
| Phase rotation test | 57Vac～400Vac (3 phase) | √ | √ |
| Frequency: 50Hz~400Hz | |||
| Single lead (L2) voltage detection |
Operating voltage: 100V~690V | √ | √ |
| Frequency: 50Hz~400Hz | |||
| Continuity test | Resistance: 0Ω~100kΩ (+50% accuracy) | √ | √ |
| Beeper and LED light indication | |||
| RCD test | Operating voltage: 230V (50Hz~400Hz) | √ | √ |
| Polarity detection | Positive & Negative | √ | √ |
| Self-inspection | All LED or LCD | √ | √ |
| No power test | Operating voltage: 100~690V | √ |
